ActivitySettings.java 文件源码

@TargetApi(Build.VERSION_CODES.M)
private boolean checkPermissions(String name) {
    PreferenceScreen screen = getPreferenceScreen();
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

    // Check if permission was revoked
    if ((name == null || "disable_on_call".equals(name)) && prefs.getBoolean("disable_on_call", false))
        if (!Util.hasPhoneStatePermission(this)) {
            prefs.edit().putBoolean("disable_on_call", false).apply();
            ((TwoStatePreference) screen.findPreference("disable_on_call")).setChecked(false);

            requestPermissions(new String[]{Manifest.permission.READ_PHONE_STATE}, REQUEST_CALL);

            if (name != null)
                return false;
        }

    return true;
}